ther·​mo·​pe·​ri·​od·​ism ˌthər-mō-ˈpir-ē-ə-ˌdi-zəm How to pronounce thermoperiodism (audio)
: the sum of the responses especially of a plant to appropriately fluctuating temperatures

Word History

First Known Use

circa 1937, in the meaning defined above

Time Traveler
The first known use of thermoperiodism was circa 1937

Dictionary Entries Near thermoperiodism

Cite this Entry

“Thermoperiodism.” Dictionary, Merriam-Webster, Accessed 20 May. 2024.

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